If detached, the ADU must typically be placed in the backyard and occupy at most 30% of the backyard's footprint.Having separately metered electric service is advantageous for managing costs and billing tenants.Adding an ADU can potentially increase your property value.

I’m actually looking to owner occupy, so having the tenant vacated would be great. 

Tenants have the right to pay what they owe to stay, unless you're owner occupied.

As a nationwide private money lender and broker, we specialize in a range of funding solutions for non-owner-occupied real estate investments.

I believe the harder you work to keep it occupied the more occupied it will be.

The other unit was occupied and she refused to leave or move to other unit. 

The other catch is whether the triplex has been occupied lately.  

Do you occupy the building? 

This might also be true even after you move out and put a renter in your unit, so make sure to analyze the property as owner-occupied and also after you move out. 

He plans to occupy one unit, and rent the others out.